Question

Observe the following balanced chemical equation and answer the given questions.
C3H8(g) + 5O2(g)
4H2O(l)
1)How many molecules of oxygen are involved in this chemical reaction?
ii) How many moles of propane are required to get 20 moles of water?
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Answer 1

Answer:

Answer

Correct option is

D

72.0g

The molar masses of propane and water are 44 g/mol and 18 g/mol respectively.

44.0 grams of propane corresponds to 1 mole of propane.

According to the balance chemical equation, C

3

H

8

(g)+5O

2

(g)→3CO

2

(g)+4H

2

O(l),

1 mole of propane gives 4 moles of water.

Thus, the combustion of 44.0 g (1 mole) of propane will give 4 moles of water.

Mass of water obtained =4×18=72.0 g.

Hence, option D is correct.

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